Ore-roasting furnace.



No. 824,263. PATENTED JUNE 26, 1906.

. 0. H; RIDER.

ORB ROASTING FURNACE.

APPLICATION FILED-AUG. 9. 1905- 2 SHEETS-333)? 1.

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No. 824,263. v PATBNTED JUNE 26, 1906.

G. H. RIDER.

ORE ROASTINGPURNAGE.

'APPLIGATIOH FILED AUG. 9. 1905. Y

2 sums-81122112.,

a To aZZ whom, it mag concern:

UNITED "STATES, PA

'rnivr OFFICE,

Specification of Letters ZPatlent Patenteanne 2e, ieoo.

Application filed August 9,: 1905 rflerial'No- 2:73.401;

Be it known that 1, CHARLES RIDER, a citizen of the United States, and a resident of St. Louis, Missouri, have invented. certain new and useful Improvements in Ore-Roasting and Fume and Gas Condensing Furnaces, of which the following is a specification containing a full, clear, and exact description, reference being had to the accompanying drawings, formin apart hereof.

My invention elates to an ore-roastin and fume and gas condensing furnace; and the object of my invention is to construct a furnace wherein ore may be very'thoroughly and quickly roasted with a minimum amount of fuel and labor, and which furnace is so constructed as to condense gases into acids and all metallic vapors and gases into oxids and chlorids. l

' My invention consists in certain novel features of construction and arrangement .of parts, which will W'lllCll Figure 1 is a front elevation of a furnace constructed in accordance with my invention. Fig. 2 is a vertical section taken longitudinally through the center of the furnace upon the line 2 2 of Fig. 1. I p

In the construction of the furnace, as shown, the main body portion 1 thereof is approximately rectangular in form, provided with the usual side walls 2, the front wall 3, the rear wall Land the stack 5, which leads upwardly from the upper rear end of the furnace. Transversely arranged inthe lower portion of the furnace is a bridge-wall 5, and a grate 6 is ositioned between this bridge-v wall and the ont wall, thus forming the firebox 7 and the ash-pit 8. -An opening through the front wall into the ash-pit isnormally closed by a door 9, and an opening into the fire-box above the grate door 10. Formed through c the furnace just above the fire-box opening is an opening 11, normally closed by a door 12, and formed through said front wall at a point near the top of the furnace is a. similar opening 13, closed by a door 14.

15 indicates a hollow metal cylinderthat is lined on the inside with fire-brick 16 or analogous material, and secured by rivets or in any suitable manner to the ends of thisbylinder are the end plates 17. Formed integral with the front one of these plates 17 is a the front wall of said front plate,

or' other suitable, driving-wheel. through the frontone of the plates 17, close to one edge thereof ,is' an opening 24,3which is normally closed by a manhead 25. Formed integral with the rear one of thebe hereinafter more fully set larger in diameter than is the forth, pointed out in my claims, and illus trated in the accompanying drawings, in

is closed by the hollow shaft 18, that. is arranged t'o'one side of the center of said front plate and extends outwardly therefromat an angle relative and said shaft extends horizontally'through a bearing 19, located in the frontwall between the openings 11 and 13 therein, and mounted on the outer end of this hollow shaft is'a gear wheel 20. ..'Arrranged to one side of the hollow shaft 18 "outside the furnace and mounted in suitable bearings is a shaft 21,- on which is mounted a pinion 22, that meshes with the gear-wheel 20,

and located 'on said shaft 21 is a pulley 23 Formed plates 17 at an angle thereto and the .same

distance oif center as is the hollowshaft 18,

isa hollow shaft. 26, which is considerably hollow shaft 18, and said hollow shaft 26 extends through the rear wall 4 of the furnace and operates in a bearing 27, located therein. The hollow shafts 18 and 26 being in direct horizontal alinement and arranged at similar angles relative the corresponding end plates 17 cause the body-cylinder to occupy an obli ue position within the upper portion of, the rnace ?1.- 'Located'infront of and above the furnace is a hopper 28, the lower .end of which terminates just above the bearing 14, and a slidin valve 29 normally closes the lower endo said hopper. Arranged in the stack v5 above the furnace is a dam er 30. A wall 31 is built immediately against the rear-side of the furnace l-and incloses a' dust and coolingchamber 32, into which the hollow shaft 26 discharges. An access to this chamber-is had through a door 33, located at the bottomof one of the side Wallsof saidchamber.

Located a short distance to-the rearof-this' chamber is a condensing tower or tank-34, and leading from the lower end .of the cham ber 32 upwardly and thence downwardly through the top ofsaid tankor tower is a pipe 35, the discharge end of which-is ar ranged adjacent the bottom of the tank 'or pipe 35 atv any convenient between the chamber 32 and the tank34 is a glazed sight opening '36. 1 A pipe 37 leads from the u per m tower and inside thereof. Locatedin this I pipe 37 is located a glazed sight-opening 38, and immediately above said glazed sightopening is located a damper 39.. A Waterinlet pipe 40 leads into the upper end of the tank 3 and a suitable sprayer 41 is secured to said Water-inlet pipe Within said tankg l. A discharge-pipe 42 leads from the lower end of the tank 34, in which pipeis arranged a cutofi valve 43. 1-

The operation of my improved furnace is as follows: The obliquely-arranged cylinder in the furnace is loaded or charged with ore by bringing the opening id to a position directly opposite the opening 13, then remov ing the manhcad from the opening "24 and fitting the inner end of a curved spout through said opening 2%, the upper end of "-.vhich spout is fitted onto the lower end of the hopper 28. (See dot-ted lines A, Fig. 2,) The ore which has been previously dumped into the hopper 28 is now allowed to discharge into the cylinder through this spout by Withdrawin the valve 29, and when the proper charge is placed Within the cylinder the manhead is returned into position to close the opening 24. The cylinder is rotated by means of a belt traveling over the pulley 23, and this rotary motion is imparted to the gear-Wheel 20 by means of the pinion 22, and as a result the hollow shafts 18 and 26 rotate in their corresponding bearin s, and the obliquely-arranged cylinder willdve likewise rotated. he said cylinder rotates, its ends are alternately elevated and lowered, so that the ore therein will be constantly turned over and over, will have a simultaneous movement to and from the ends of the cylinder, and this constant rotation andrubbing action very thoroughly removes the oxide, chlorids, and sulfates as fast as they form on the molecules of ore, thus presenting fresh surfaces constantly to the action of the air that enters the cylinder through the small hollow shaft 18. The cylinder during this rotation is kept at the proper heat by means of a fire located upon the rate 6, which fire is fed through the opening 0% by the door 10. In this manner the entire body of ore is very thoroughly and quickly roasted Without the fire and products of coinbustion coming in direct contact with the ore. The burn in sulfur and other volatilized matter arising from the ore that is being roasted Within the cylinder pass outwardly through the hollow shaft 26 into the dust and cooling chamber 32, and a certain amount of ozrids and similar heavier particl s of the fumes will be deposited on the bottom of said chamber. From this chamber the fumes and gases pass into and through the pipe 35 and are discharged into the bottom 0' the con- (lensing tower or tank 34. Here they are subjected to a spray of waterfrorn the s rayer 41 and. said fumes will be very thorouglny we densed and settle to the bottom of said tank. The gases containing no value will finally disosed o ienings' 36 and .pipe 37 into the stack '5.

scenes charge through the pipe 37 into the stack 5 and pass off with the products of combustion arising from the fire in the fire-box 7.

In order to more thoroughly convert the suliurous gas into sulfuric acid When roasting a sul'lid ore, a receptacle containing nitric acid is placed. in the dust-chamber, (see dotted lines B, Fig.1) or a small amount of nitrate of soda may be added to the ore before roasting. If it be desired to convert a part of the ore into soluble chloride, common salt is added to the ore before roasting. To convert oxids into sulfates, sulfur or iron disulfid is added to the ore before roasting.

It has been found in practice with my improved furnace that with one houfisroasting at a low red heat and rotating the cylinder at about fifteen to twenty times per minute will result in a'complete oxidation of the iron and Will convert copper, nickel, cobalt, gold, and silver and many other metals into soluble sulfates and chlorids (provided salt has been added to the ore) in a very thorough manner and that approximately eighty per cent. of the metallic values can be readily put into solution byleaching with hot Water. The balance, or twenty per cent, is easily soluble in the acics condensed in the tank during the roasting of the ore, thus resulting in a com plete solution ofthe metallic values in most all ores Without the use of reagents other than those created when roasting the ore The charge of ore is discharged from the cylinder by so rotating said cylinder as to bring the opening 24 directly opposite the opening 11, and when the n'lanhead 25 has been removed a removable curved spout, such as G, Fig. 2, is arranged so as to convey ore from the cylinder to a suitable chute outside the furnace.

By my improved furnace there is absolutely no loss in metallic values in the roasting of ore, and said roastingis accomplished with a great saving of fuel, time, and. labor, and all the fumes and. gases containing metallic values are readily condensed in a very effectual manner within the condensing-tanlg from whence they may be readily removed.

The operation of the furnace or of the passage of, the fumes and gases may be at all times viewed by means of the lazed sight- The fire an draft thereof fromthe firebox 7 pass upwardly through the furnace and out through the stack 5, and this natural draft causes a corresponding draft of air through the ore-condensing cylinder into the dust-charnber and from thence through the pipe 35 into and through the condenser and'from thence through the Thus the fumes from the roasting ore are Withdrawn from the cylinder by means of the natural draft of the fire used for roasting the ore.

I claim- 1. In an ore-roasting furnace of the class 7 described, a roasting-chamber provided with inlet and outlet doors in one wall, an obliquely-disp'osed cylindrical retort arranged for rotation in the chamber, heads fixed in said retort in one of which heads is formed an opening so located as to coincide with the openings in the wall of the chamber, and a p ate normally closing said opening; substantially as specified.

2. In an ore-roasting furnace of the class described, a roasting-chamber provided with inlet and outlet doors in one wall, an obliquely-disposed cylindrical retort arranged for rotation in the chamber, heads fixed in said retort in one of which heads is formed an opening so located as to coincide with the openings in the wall of the chamber, a late i with a stack leading upwardly from its rear end, an obliquely-disposed cylindrical retort arranged for rotation in the chamber, there being an opening in one end of the retort so the draft from the retort discharges, a condenser, a tubular connection from the dustchamber to the condenser, and a'tubular' the stack;-

connection from the condenser to substantially as specified, 4. In an ore-roasting furnace of the class described, a roasting-chamberprovided with inlet and outlet doors in one wall, a retort arranged for rotation in the chamber, there ,being an opening inone end of the retort so located as to coincide with the openings in the wall of the chamber, a plate normally closing said openings, a feed-hopper arranged above the chamber over one of the 0 enings in the wall thereof, and a discharge-c ute ar ranged beneath the opposite opening in the Wall; substantially as specified.

In testimony i'vhereot I have signed my name to this specification in presence of two subscribing witnesses.

CHARLES H. RIDER. Witnesses:

EDWARD E. LONGAN, E. M. HARBL-l -JTON. 

